[PATCH V4 15/27] ublk: abort requests filled in event kfifo

Ming Lei
2025-11-21T02:00:09Z

In case of BATCH_IO, any request filled in event kfifo, they don't get
chance to be dispatched any more when releasing ublk char device, so
we have to abort them too.

Add ublk_abort_batch_queue() for aborting this kind of requests.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
drivers/block/ublk_drv.c | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index 2e5e392c939e..849199771f86 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -2241,7 +2241,8 @@ static int ublk_ch_mmap(struct file *filp, struct vm_area_struct *vma)
static void __ublk_fail_req(struct ublk_device *ub, struct ublk_io *io,
struct request *req)
{
- WARN_ON_ONCE(io->flags & UBLK_IO_FLAG_ACTIVE);
+ WARN_ON_ONCE(!ublk_dev_support_batch_io(ub) &&
+ io->flags & UBLK_IO_FLAG_ACTIVE);

if (ublk_nosrv_should_reissue_outstanding(ub))
blk_mq_requeue_request(req, false);
@@ -2251,6 +2252,26 @@ static void __ublk_fail_req(struct ublk_device *ub, struct ublk_io *io,
}
}

+/*
+ * Request tag may just be filled to event kfifo, not get chance to
+ * dispatch, abort these requests too
+ */
+static void ublk_abort_batch_queue(struct ublk_device *ub,
+ struct ublk_queue *ubq)
+{
+ while (true) {
+ struct request *req;
+ short tag;
+
+ if (!kfifo_out(&ubq->evts_fifo, &tag, 1))
+ break;
+
+ req = blk_mq_tag_to_rq(ub->tag_set.tags[ubq->q_id], tag);
+ if (req && blk_mq_request_started(req))
+ __ublk_fail_req(ub, &ubq->ios[tag], req);
+ }
+}
+
/*
* Called from ublk char device release handler, when any uring_cmd is
* done, meantime request queue is "quiesced" since all inflight requests
@@ -2269,6 +2290,9 @@ static void ublk_abort_queue(struct ublk_device *ub, struct ublk_queue *ubq)
if (io->flags & UBLK_IO_FLAG_OWNED_BY_SRV)
__ublk_fail_req(ub, io, io->req);
}
+
+ if (ublk_support_batch_io(ubq))
+ ublk_abort_batch_queue(ub, ubq);
}

static void ublk_start_cancel(struct ublk_device *ub)
--
2.47.0